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                # Python 程序:使用遞歸查找數字的階乘 > 原文: [https://www.programiz.com/python-programming/examples/factorial-recursion](https://www.programiz.com/python-programming/examples/factorial-recursion) #### 在此程序中,您將學習使用遞歸函數查找數字的階乘。 要理解此示例,您應該了解以下 [Python 編程](/python-programming "Python tutorial")主題: * [Python `if...else`語句](/python-programming/if-elif-else) * [Python 函數](/python-programming/function) * [Python 遞歸](/python-programming/recursion) * * * 一個數字的階乘是從 1 到該數字的所有整數的乘積。 例如,階乘 6 是`1*2*3*4*5*6 = 720`。 沒有定義負數的階乘,零階的階乘是 1,`0! = 1`。 ## 源代碼 ```py # Factorial of a number using recursion def recur_factorial(n): if n == 1: return n else: return n*recur_factorial(n-1) num = 7 # check if the number is negative if num < 0: print("Sorry, factorial does not exist for negative numbers") elif num == 0: print("The factorial of 0 is 1") else: print("The factorial of", num, "is", recur_factorial(num)) ``` **輸出** ```py The factorial of 7 is 5040 ``` **注意**:要查找另一個數字的階乘,請更改`num`的值。 在此,編號存儲在`num`中。 該數字將傳遞給`recur_factorial()`函數以計算該數字的階乘。
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